2 Unix SMB/Netbios implementation.
4 time handling functions
5 Copyright (C) Andrew Tridgell 1992-1995
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 This stuff was largely rewritten by Paul Eggert <eggert@twinsun.com>
31 int extra_time_offset
= 0;
33 extern int DEBUGLEVEL
;
40 #define TIME_T_MIN (0 < (time_t) -1 ? (time_t) 0 \
41 : ~ (time_t) 0 << (sizeof (time_t) * CHAR_BIT - 1))
44 #define TIME_T_MAX (~ (time_t) 0 - TIME_T_MIN)
49 /*******************************************************************
50 a gettimeofday wrapper
51 ********************************************************************/
52 void GetTimeOfDay(struct timeval
*tval
)
57 gettimeofday(tval
,NULL
);
61 #define TM_YEAR_BASE 1900
63 /*******************************************************************
64 yield the difference between *A and *B, in seconds, ignoring leap seconds
65 ********************************************************************/
66 static int tm_diff(struct tm
*a
, struct tm
*b
)
68 int ay
= a
->tm_year
+ (TM_YEAR_BASE
- 1);
69 int by
= b
->tm_year
+ (TM_YEAR_BASE
- 1);
70 int intervening_leap_days
=
71 (ay
/4 - by
/4) - (ay
/100 - by
/100) + (ay
/400 - by
/400);
73 int days
= 365*years
+ intervening_leap_days
+ (a
->tm_yday
- b
->tm_yday
);
74 int hours
= 24*days
+ (a
->tm_hour
- b
->tm_hour
);
75 int minutes
= 60*hours
+ (a
->tm_min
- b
->tm_min
);
76 int seconds
= 60*minutes
+ (a
->tm_sec
- b
->tm_sec
);
80 /*******************************************************************
81 return the UTC offset in seconds west of UTC
82 ******************************************************************/
83 static int TimeZone(time_t t
)
85 struct tm tm_utc
= *(gmtime(&t
));
86 return tm_diff(&tm_utc
,localtime(&t
));
90 /*******************************************************************
91 init the time differences
92 ********************************************************************/
95 serverzone
= TimeZone(time(NULL
));
96 DEBUG(4,("Serverzone is %d\n",serverzone
));
100 /*******************************************************************
101 return the same value as TimeZone, but it should be more efficient.
103 We keep a table of DST offsets to prevent calling localtime() on each
104 call of this function. This saves a LOT of time on many unixes.
106 Updated by Paul Eggert <eggert@twinsun.com>
107 ********************************************************************/
108 static int TimeZoneFaster(time_t t
)
110 static struct dst_table
{time_t start
,end
; int zone
;} *dst_table
= NULL
;
111 static int table_size
= 0;
115 if (t
== 0) t
= time(NULL
);
117 /* Tunis has a 8 day DST region, we need to be careful ... */
118 #define MAX_DST_WIDTH (365*24*60*60)
119 #define MAX_DST_SKIP (7*24*60*60)
121 for (i
=0;i
<table_size
;i
++)
122 if (t
>= dst_table
[i
].start
&& t
<= dst_table
[i
].end
) break;
125 zone
= dst_table
[i
].zone
;
130 dst_table
= (struct dst_table
*)Realloc(dst_table
,
131 sizeof(dst_table
[0])*(i
+1));
137 dst_table
[i
].zone
= zone
;
138 dst_table
[i
].start
= dst_table
[i
].end
= t
;
140 /* no entry will cover more than 6 months */
141 low
= t
- MAX_DST_WIDTH
/2;
145 high
= t
+ MAX_DST_WIDTH
/2;
149 /* widen the new entry using two bisection searches */
150 while (low
+60*60 < dst_table
[i
].start
) {
151 if (dst_table
[i
].start
- low
> MAX_DST_SKIP
*2)
152 t
= dst_table
[i
].start
- MAX_DST_SKIP
;
154 t
= low
+ (dst_table
[i
].start
-low
)/2;
155 if (TimeZone(t
) == zone
)
156 dst_table
[i
].start
= t
;
161 while (high
-60*60 > dst_table
[i
].end
) {
162 if (high
- dst_table
[i
].end
> MAX_DST_SKIP
*2)
163 t
= dst_table
[i
].end
+ MAX_DST_SKIP
;
165 t
= high
- (high
-dst_table
[i
].end
)/2;
166 if (TimeZone(t
) == zone
)
167 dst_table
[i
].end
= t
;
172 DEBUG(1,("Added DST entry from %s ",
173 asctime(localtime(&dst_table
[i
].start
))));
174 DEBUG(1,("to %s (%d)\n",asctime(localtime(&dst_table
[i
].end
)),
182 /****************************************************************************
183 return the UTC offset in seconds west of UTC, adjusted for extra time offset
184 **************************************************************************/
185 int TimeDiff(time_t t
)
187 return TimeZoneFaster(t
) + 60*extra_time_offset
;
191 /****************************************************************************
192 return the UTC offset in seconds west of UTC, adjusted for extra time
193 offset, for a local time value. If ut = lt + LocTimeDiff(lt), then
194 lt = ut - TimeDiff(ut), but the converse does not necessarily hold near
195 daylight savings transitions because some local times are ambiguous.
196 LocTimeDiff(t) equals TimeDiff(t) except near daylight savings transitions.
197 +**************************************************************************/
198 static int LocTimeDiff(time_t lte
)
200 time_t lt
= lte
- 60*extra_time_offset
;
201 int d
= TimeZoneFaster(lt
);
204 /* if overflow occurred, ignore all the adjustments so far */
205 if (((lte
< lt
) ^ (extra_time_offset
< 0)) | ((t
< lt
) ^ (d
< 0)))
208 /* now t should be close enough to the true UTC to yield the right answer */
213 /****************************************************************************
214 try to optimise the localtime call, it can be quite expenive on some machines
215 ****************************************************************************/
216 struct tm
*LocalTime(time_t *t
)
226 #define TIME_FIXUP_CONSTANT (369.0*365.25*24*60*60-(3.0*24*60*60+6.0*60*60))
228 /****************************************************************************
229 interpret an 8 byte "filetime" structure to a time_t
230 It's originally in "100ns units since jan 1st 1601"
232 It appears to be kludge-GMT (at least for file listings). This means
233 its the GMT you get by taking a localtime and adding the
234 serverzone. This is NOT the same as GMT in some cases. This routine
235 converts this to real GMT.
236 ****************************************************************************/
237 time_t interpret_long_date(char *p
)
245 if (thigh
== 0) return(0);
247 d
= ((double)thigh
)*4.0*(double)(1<<30);
248 d
+= (tlow
&0xFFF00000);
251 /* now adjust by 369 years to make the secs since 1970 */
252 d
-= TIME_FIXUP_CONSTANT
;
254 if (!(TIME_T_MIN
<= d
&& d
<= TIME_T_MAX
))
257 ret
= (time_t)(d
+0.5);
259 /* this takes us from kludge-GMT to real GMT */
261 ret
+= LocTimeDiff(ret
);
267 /****************************************************************************
268 put a 8 byte filetime from a time_t
269 This takes real GMT as input and converts to kludge-GMT
270 ****************************************************************************/
271 void put_long_date(char *p
,time_t t
)
277 SIVAL(p
,0,0); SIVAL(p
,4,0);
281 /* this converts GMT to kludge-GMT */
282 t
-= TimeDiff(t
) - serverzone
;
286 d
+= TIME_FIXUP_CONSTANT
;
290 thigh
= (uint32
)(d
* (1.0/(4.0*(double)(1<<30))));
291 tlow
= (uint32
)(d
- ((double)thigh
)*4.0*(double)(1<<30));
298 /****************************************************************************
299 check if it's a null mtime
300 ****************************************************************************/
301 static BOOL
null_mtime(time_t mtime
)
303 if (mtime
== 0 || mtime
== 0xFFFFFFFF || mtime
== (time_t)-1)
308 /*******************************************************************
309 create a 16 bit dos packed date
310 ********************************************************************/
311 static uint16
make_dos_date1(time_t unixdate
,struct tm
*t
)
314 ret
= (((unsigned)(t
->tm_mon
+1)) >> 3) | ((t
->tm_year
-80) << 1);
315 ret
= ((ret
&0xFF)<<8) | (t
->tm_mday
| (((t
->tm_mon
+1) & 0x7) << 5));
319 /*******************************************************************
320 create a 16 bit dos packed time
321 ********************************************************************/
322 static uint16
make_dos_time1(time_t unixdate
,struct tm
*t
)
325 ret
= ((((unsigned)t
->tm_min
>> 3)&0x7) | (((unsigned)t
->tm_hour
) << 3));
326 ret
= ((ret
&0xFF)<<8) | ((t
->tm_sec
/2) | ((t
->tm_min
& 0x7) << 5));
330 /*******************************************************************
331 create a 32 bit dos packed date/time from some parameters
332 This takes a GMT time and returns a packed localtime structure
333 ********************************************************************/
334 static uint32
make_dos_date(time_t unixdate
)
339 t
= LocalTime(&unixdate
);
341 ret
= make_dos_date1(unixdate
,t
);
342 ret
= ((ret
&0xFFFF)<<16) | make_dos_time1(unixdate
,t
);
347 /*******************************************************************
348 put a dos date into a buffer (time/date format)
349 This takes GMT time and puts local time in the buffer
350 ********************************************************************/
351 void put_dos_date(char *buf
,int offset
,time_t unixdate
)
353 uint32 x
= make_dos_date(unixdate
);
357 /*******************************************************************
358 put a dos date into a buffer (date/time format)
359 This takes GMT time and puts local time in the buffer
360 ********************************************************************/
361 void put_dos_date2(char *buf
,int offset
,time_t unixdate
)
363 uint32 x
= make_dos_date(unixdate
);
364 x
= ((x
&0xFFFF)<<16) | ((x
&0xFFFF0000)>>16);
368 /*******************************************************************
369 put a dos 32 bit "unix like" date into a buffer. This routine takes
370 GMT and converts it to LOCAL time before putting it (most SMBs assume
371 localtime for this sort of date)
372 ********************************************************************/
373 void put_dos_date3(char *buf
,int offset
,time_t unixdate
)
375 if (!null_mtime(unixdate
))
376 unixdate
-= TimeDiff(unixdate
);
377 SIVAL(buf
,offset
,unixdate
);
380 /*******************************************************************
381 interpret a 32 bit dos packed date/time to some parameters
382 ********************************************************************/
383 static void interpret_dos_date(uint32 date
,int *year
,int *month
,int *day
,int *hour
,int *minute
,int *second
)
387 p0
=date
&0xFF; p1
=((date
&0xFF00)>>8)&0xFF;
388 p2
=((date
&0xFF0000)>>16)&0xFF; p3
=((date
&0xFF000000)>>24)&0xFF;
390 *second
= 2*(p0
& 0x1F);
391 *minute
= ((p0
>>5)&0xFF) + ((p1
&0x7)<<3);
392 *hour
= (p1
>>3)&0xFF;
394 *month
= ((p2
>>5)&0xFF) + ((p3
&0x1)<<3) - 1;
395 *year
= ((p3
>>1)&0xFF) + 80;
398 /*******************************************************************
399 create a unix date (int GMT) from a dos date (which is actually in
401 ********************************************************************/
402 time_t make_unix_date(void *date_ptr
)
408 dos_date
= IVAL(date_ptr
,0);
410 if (dos_date
== 0) return(0);
412 interpret_dos_date(dos_date
,&t
.tm_year
,&t
.tm_mon
,
413 &t
.tm_mday
,&t
.tm_hour
,&t
.tm_min
,&t
.tm_sec
);
416 /* mktime() also does the local to GMT time conversion for us */
422 /*******************************************************************
423 like make_unix_date() but the words are reversed
424 ********************************************************************/
425 time_t make_unix_date2(void *date_ptr
)
429 x
= IVAL(date_ptr
,0);
430 x2
= ((x
&0xFFFF)<<16) | ((x
&0xFFFF0000)>>16);
433 return(make_unix_date((void *)&x
));
436 /*******************************************************************
437 create a unix GMT date from a dos date in 32 bit "unix like" format
438 these generally arrive as localtimes, with corresponding DST
439 ******************************************************************/
440 time_t make_unix_date3(void *date_ptr
)
442 time_t t
= IVAL(date_ptr
,0);
448 /****************************************************************************
449 set the time on a file
450 ****************************************************************************/
451 BOOL
set_filetime(char *fname
,time_t mtime
)
453 struct utimbuf times
;
455 if (null_mtime(mtime
)) return(True
);
457 times
.modtime
= times
.actime
= mtime
;
459 if (sys_utime(fname
,×
)) {
460 DEBUG(4,("set_filetime(%s) failed: %s\n",fname
,strerror(errno
)));
467 /****************************************************************************
468 return the date and time as a string
469 ****************************************************************************/
470 char *timestring(void )
472 static char TimeBuf
[100];
473 time_t t
= time(NULL
);
474 struct tm
*tm
= LocalTime(&t
);
477 strcpy(TimeBuf
, asctime(tm
));
478 #elif defined(CLIX) || defined(CONVEX)
479 strftime(TimeBuf
,100,"%m/%d/%y %I:%M:%S %p",tm
);
481 strftime(TimeBuf
,100,"%D %r",tm
);
482 #elif defined(TZ_TIME)
484 int zone
= TimeDiff(t
);
485 int absZoneMinutes
= (zone
<0 ? -zone
: zone
) / 60;
486 size_t len
= strftime(TimeBuf
,sizeof(TimeBuf
)-6,"%D %T",tm
);
487 sprintf(TimeBuf
+len
," %c%02d%02d",
488 zone
<0?'+':'-',absZoneMinutes
/60,absZoneMinutes
%60);
491 strftime(TimeBuf
,100,"%D %T",tm
);